Explosive and thermic compositions or charges – Containing hydrazine or hydrazine derivative
Patent
1998-01-27
2000-03-07
Miller, Edward A.
Explosive and thermic compositions or charges
Containing hydrazine or hydrazine derivative
149 46, 149 61, 149 77, 1491094, 1491096, 149 17, 264 31, C06B 3128, C06B 2100
Patent
active
060335009
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to an explosive composition available for a gas generating agent or an enhancer (a transfer charge) for an airbag for occupant restraint system in a vehicle and a producing method therefor. More particularly, the present invention relates to an airbag explosive composition easy to control a combustion velocity, able to be safely produced, excellent in thermal shock resistance and strength of the produced tablet and capable of producing a clean gas from the combustion, and the producing method therefor.
BACKGROUND ART
An airbag system, which is occupant restraint system, has been widely adopted in recent years for improving safety of the occupants in a vehicle. The airbag system operates on the principle that a gas generator is operated under control of signals from a sensor detecting a collision, to inflate an airbag between occupant and a car body. The gas generator is required to have a function to produce a required and sufficient amount of clean gas containing no harmful gas in a short time. On the other hand, the gas generating agent is press-formed into a tablet form for stability to the combustion, and the transfer charge is formed into a granule form for use. The tablets and granules are required to maintain their initial combustion characteristics over a long time even under various harsh environments. In the event that the tablets deforms or decreases in strength due to deterioration with age, change of environments and the like, the combustibility of the explosive composition will exhibit at an abnormally earlier time than the initial combustibility, so there is a fear that the airbag or the gas generator itself may be broken with the abnormal combustion in case of a collision, to fail in accomplishing the aim of protecting the occupants or even cause them injury.
To satisfy those required functions, gas generating agents containing metallic compound azide such as sodium azide and potassium azide as their major ingredient have been used hitherto. These known gas generating agents are widely used in terms of their advantages that they are burnt momentarily; that the ingredient of combustion gas is substantially nitrogen gas only, so that no harmful gas such as CO (carbon monoxide) or NOx (Nitrogen oxide) is produced; and that since the combustion velocity is little influenced by the environment or the structure of the gas generator, it is easy to design the gas generator. However, these known gas generating agents have a disadvantage to be readily exploded by impact and friction, so it is difficult to make them explosion-proof, as demonstrated by large and small explosion accidents happened here and there in the manufacturing process. Further, the known gas generating agents have a notable disadvantage that they decompose in the presence of water and acid then produce a harmful gas. Due to this, it comes to be urgently necessary these days to develop a safer gas generating agent and put it into practical use, in substitution for the known gas generating agents whose major ingredient is the metallic compound azide.
On the other hand, the method in which tetrazoles including amino tetrazole are mixed with and used in combination with the metallic compound azide has been proposed in, for example, Japanese Laid-open Patent Publications No. Sho 49(1974)-87583, No. Hei 2(1990)-184590 and No. Hei 2(1990)-221179. Since molecules of the tetrazoles have a high proportion of atoms of nitrogen such that production of CO can be suppressed, almost no CO is produced in the combustion gas, as in the case with the metallic compound azide. Besides, the tetrazoles are superior to the above said metallic compound azide in far less danger and toxicity. The gas generating agent of this type comprising the mixture of the tetrazoles with the metallic compound azide succeeded in lessening the problems involved in the gas generating agent containing the metallic compound azide as its major ingredient, as compared with the one singly using the metallic compound azide, but h
REFERENCES:
patent: 5035757 (1991-07-01), Poole
patent: 5139588 (1992-08-01), Poole
patent: 5386775 (1995-02-01), Poole et al.
patent: 5472535 (1995-12-01), Mendenhall et al.
patent: 5514230 (1996-05-01), Khandhadia
patent: 5518054 (1996-05-01), Mitson et al.
patent: 5765866 (1998-06-01), Canterberry et al.
Ikeda Kenjiro
Ito Yuji
Iwasaki Makoto
Kuroiwa Akihiko
Minoguchi Ryo
Miller Edward A.
Nippon Kayaku Kabushiki-Kaisha
Sensor Technology Co. Ltd.
LandOfFree
Airbag explosive composition and process for producing said comp does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Airbag explosive composition and process for producing said comp, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Airbag explosive composition and process for producing said comp will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-359150